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  <title>Qt 4.3: rgba.js Example File (script/context2d/scripts/rgba.js)</title>
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<pre> var ctx = document.getElementById('tutorial').getContext('2d');

   // Draw background
   ctx.fillStyle = 'rgb(255,221,0)';
   ctx.fillRect(0,0,150,37.5);
   ctx.fillStyle = 'rgb(102,204,0)';
   ctx.fillRect(0,37.5,150,37.5);
   ctx.fillStyle = 'rgb(0,153,255)';
   ctx.fillRect(0,75,150,37.5);
   ctx.fillStyle = 'rgb(255,51,0)';
   ctx.fillRect(0,112.5,150,37.5);

   // Draw semi transparent rectangles
   for (i=0;i&lt;10;i++){
     ctx.fillStyle = 'rgba(255,255,255,'+(i+1)/10+')';
     for (j=0;j&lt;4;j++){
       ctx.fillRect(5+i*14,5+j*37.5,14,27.5)
     }
   }</pre>
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